What Is an API Endpoint?

An API endpoint is a digital location where an API receives requests for a specific resource on its server. In an API, an endpoint is usually a Uniform Resource Locator (URL) that provides the location of a resource on the server.

To fully understand this definition and how endpoints fit into the API model, let's take a quick look at how APIs work.

To integrate two software applications over the internet, one application, called the client, sends a request to the other application's API. The client can request a resource from the application's database or ask the server to perform an action.

After receiving and validating the client's request, the API performs the requested action and then sends a response back to the client. This response includes the status of the request (for example, completed or rejected) and any resources requested by the client.

APIs typically let you access many different resources on a server. For example, a social network API might let clients retrieve and modify post content, user profiles, and images. A news site's API would provide access to its articles, authors, and media such as podcasts and videos.

Knowing this, how do clients specify which resource they want to access in their request?

The answer is to use the right endpoint. In their requests, clients specify the endpoint as a URL. This URL tells the server: “The resource I need is located here.”

This process is similar to accessing web pages in a browser. Web browsers load web pages by sending a URL to a web server, and the server responds with the requested page. Similarly, a client needs the right endpoint URL to request a specific resource from an API.

Endpoint and API

It's important to note that endpoints and APIs are different. An endpoint is a component of an API, while an API is a set of rules that allows two applications to share resources. Endpoints are the locations of resources, and an API uses endpoint URLs to retrieve the requested resources.

API Endpoint Examples

Developers list all the endpoints in their API documentation so users know how to access the resources they need. But what do these endpoints look like in practice? Let's take a look at a few real-world examples from leading platforms.

Twitter API Endpoint Example

The Twitter API provides data about tweets, direct messages, users, and more.

Let's say you want to retrieve the content of a specific tweet. To do this, you can use the tweet lookup endpoint, which has the URL https:// api.twitter.com/2/tweets/{id} (where {id} is the tweet's unique ID).

Now let's say you want your website to stream public tweets in real time so your visitors can keep up with a particular topic. You can use Twitter's filtered stream endpoint, whose URL is https:// api.twitter.com/2/tweets/search/stream.

Spotify API Endpoint Example

The Spotify API gives developers access to songs, artists, playlists, and user data. For example, if you want to retrieve a particular album, you can access any album in Spotify's catalog with the endpoint https:// api.spotify.com/v1/albums/{id} (where {id} — the unique album number). ID).

Or, let's say you want to send a request that makes a user follow a playlist. In this case, send a PUT request to the endpoint https:// api.spotify.com/v1/playlists/{playlist_id}/followers (where {playlist_id} — the unique playlist ID).

YouTube API Endpoint Example

The YouTube API, among other things, makes it easy to embed YouTube videos on any website. When you go to a video on YouTube and copy its embed code, you're requesting the video from the YouTube API.

Another way to retrieve videos through the YouTube API is to request them from the endpoint https:// www.googleapis.com/youtube/v3/videos, which returns a list of videos matching the parameters specified in the request.

Why Are API Endpoints Important?

One of the first questions you ask about APIs is: why do so many companies share their data openly and for free?

More often than not, the answer is scale. As companies grow, their staff realize they have more ideas than time and resources to develop them. It's usually easier to work with other external companies that specialize in those ideas than to develop them in-house.

By creating an API, a company allows third-party developers to build applications that improve adoption and use of its platform. In this way, a business can build an ecosystem that becomes dependent on data from its API, often leading to additional revenue opportunities.

Take HubSpot's APIs as another example: by exposing the functionality and data of our software through APIs, developers can integrate their applications with our technology, resulting in an ecosystem of applications that expands our reach and makes things much easier for customers who want to use other applications alongside HubSpot. .

As we've learned, endpoints are literally at the heart of an API. They are where the client and server communicate. Without properly structured and functioning endpoints, an API will be confusing at best and broken at worst. As you provide more data through your API, it's essential to make sure every endpoint provides valuable resources for clients.

How to Test API Endpoints

When discussing web APIs, we usually mean a type of API called a REST API, which uses HTTP methods to tell the API what action to take. The four most common HTTP methods in API requests are:

GET: retrieves a resource
POST: creates a resource
PUT: updates an existing resource
DEL: deletes a resource

Let's see how to make a request to the Twitter API filtered stream endpoint. Requests are formatted by writing the HTTP method followed by the endpoint URL. So, a request to the filtered stream endpoint would look like this: POST https:// api.twitter.com/2/tweets/search/stream.

We can apply filtering criteria to the endpoint in the form of rules. To build these rules, you'll use a set of operators. In this example, you can use two Twitter API operators — from: and has:links — to view only tweets from specific accounts that contain links.

In your request, you'll use the HTTP method POST. In addition to the rule mentioned above, you should specify the content type and authorization in your request. Below, the content type is defined as “application/json,” so the request is displayed in JavaScript Object Notation (JSON) format.

There are several online tools for testing an API endpoint. Here we'll use c URL, a command-line tool that supports HTTP. It can make requests, retrieve data, and send data, so it's a great tool for testing APIs.

The Future of APIs in Business

We live in a world that now demands open and accessible content for everyone — a natural development of this process is for publishers themselves to release their own APIs so clients can develop applications alongside them.

Sharing APIs applies to all businesses: not just those that operate online, but anyone with a web tool or component in their organization. Of course, this concept will pose challenges for some organizations, the main one being making sure everyone understands how APIs work.

It's easy to get bogged down in API jargon. However, it's easier to understand how APIs work when you apply them to real-world cases. Hopefully, you now have a better grasp of one of their key components — endpoints.